High fiber count, compact, loose tube optical fiber cable employing ribbon units and flexible buffer tubes
US6292611A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jan 2, 2001 |
| Grant date | Sep 18, 2001 |
| Priority date | — |
| Expiry date | Jan 2, 2021 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/44384
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical fiber cable includes a central strength or structural member, buffer tubes of the desired flexibility are S-Z wound around the central member with a predetermined lay, preferably with alternating single turn S-Z lays and the buffer tubes loosely receive optical fiber ribbon stacks, the pitch of the twist being selected to provide a predetermined ratio of the pitch of the buffer tube lay. The wall thickness of the buffer tubes is selected to provide the desired buffer tube strength and crush resistance, and the diameters of the buffer tubes bores are selected in relation to the size of the optical fiber ribbon stacks so as to provide a predetermined clearance. The clearance C is between about 1 mm and about 2 mm with the relation: EQU C=(T.sub.I.sup.2 -W.sub.R.sup.2).sup.1/2 -H.sub.R Where T.sub.I is the inner diameter of the tube, W.sub.R is the width of said stack and H.sub.R is a thickness of the stack.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.